I have a metal cabinet about 42 inches long. Want to use the Harbor Freight Mobile Base to set it on. Cabinet would not hold more than the 300 lb. limit. Concerned about the length. Has anyone used this mobile baseto support a 21”x42” cabinet or similar?

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There is no limit to the length/width you can go, within reason… so as long as most of the weight is supported by the 4 corners, I don’t see why it wouldn’t work for you. However, it has 2 fixed and 2 swivel casters, so it might not be as easy to move as if you had 4 swivel casters. Also, they claim a 300 pound limit, so you might be pushing the upper limit of what it can hold. Have you considered something like the lifting caster brackets from Rockler? They would be easy to attach to a metal cabinet, and if you use small nuts/bolts instead of screws, they would be extremely sturdy. The extra benefit is that it lowers the cabinet to the floor, instead of always sitting on four points (2 casters and 2 pads), so it’s more stable when not being moved around.